Xconomy - Minneapolis, MN-based Medtronic (NYSE: MDT), the medical device giant, said today it is reviving plans to spin off the Physio-Control unit in Redmond, WA as an independent company. Physio-Control, which makes heart defibrillators that treat sudden cardiac arrest, has been dogged by manufacturing problems for years, although it was given clearance by the FDA to resume unrestricted sales last February, as noted today by The Seattle Times.